Is it possible that I met my soulmate at 15?

So this might sound kinda crazy and clichè especially because I'm young, but I'm pretty sure my boyfriend is the love of my life. We're both 17 now, but we met when we were 15 and were best friends for about a year until we started dating, and we've been happily together for a year and a half now! I've had other boyfriends but I NEVER felt like this about any of them. Even after so long he still gives me butterflies when he tells me he loves me. He's my best friend, and I've never met someone who's so dedicated to constantly making sure I'm happy. Like any couple we do get in disagreements once and a while, but he always works to understand my side and tries to work everything out. He's extremely mature for 17 and I don't know any guys like him. I honestly feel like this is all an underestimation, as I don't even know how to put my love for him into words, he's made me a better person and he's taught me so many lessons. We talk about marriage and kids pretty often, and I want to believe it all, but at the same time I know that I shouldn't get hung up on that as I'm so young. He's honestly anything I could ever ask for and more. But has anyone on here ever married their HS sweetheart? Is it really possible to meet the one so early?